[gold-users] Unauthorized overdrafts

I noticed that although i left the CreditLimit for all project
allocations set
to the default value (0) , it is possible to reserve and charge any number
of credits to any account using greserve/gcharge. Is this the normal
behavior of the application
and if it is , how can i prevent this from happening? Using the latest
version of GOLD...
Thanks,
Tolis